Cutting attachment for cutting-machines



J. P. WEIS.

CUTIIZNYG ATTACHMENT FOR CUTTING MACHINES. APPLICATION FILED JAN.2, 1919.

1,342,008. PdtentedJuneL1920.

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JOHN PETER wEIs, 0E NYAGK,-NEW YoEK, AssIGN'oE or ONE-HALF TO METRO- POLITAN SEWING MACHINE CORPORATION, or DOVER, DELAWARE, A 0031 0 RATION OF DELAWARE. 1

CUTTING ATTACHMENT FOR CUTTING-MACHINES.

To all whom it may concern:

Be it known that I, J OHN PETER 151s, a citizen of the United States, residing at Nyack, in the county of Rockland and State of New York, have invented certain new and useful Improvements in Cutting Attachments for Cutting-Machines, of which the following is a specification.

The object of this invention is to produce a high-speed fabric-cutting mechanism. This application is a division of my pending application Serial No. 867,005, filed October 16, 1914.

The accompanying drawing forming a part hereof illustrates in side elevation the best form of my new attachment now known to me. It comprises a bracket 1 having a recessed wall 2 for engagement with a suitable support for combinative operation with other instrumentalities not shown, and a clamp-screw 3 as a means of detachably securing the bracket to a support therefor. 4 is a bell-crank lever pivoted at 5 to a side of the bracket; 6 is a link one end of which is pivotally connected at 7 with the upper end of the bell-crank lever. The other end of the link is pivotally connected to an upstanding vibrating knife 8 at 9, the knife having a cutting point and below the point a curved edge at 10, above the pivotal connection 9. The lower end of the knife is pivotally connected at 11 to one end of a lever 12 which midway between its ends is pivoted at 13 to an end of a supporting rod 14. The other end of lever 12 is pivoted at 15 to an end of a pitman 16, the other end of which is connected at 17 to one of the two crank pins of a crank shaft 18. The other end of the bell crank lever 4 is pivotally connected at 19 to an end of a pitman 20 the other end of which is pivoted at 21 to the other crank pin of crank shaft 18 which has a fixed drive wheel 22 for application of power to rotate the crank shaft.

When the crank-shaft is rotated, the pitmen 16 and 20 are rapidly reciprocated in alternation one with the other, giving to the free cutting point and edge of the knife, through the rocking movement of the bellcrank lever, an edgewise reciprocation; and, through the vibration of the lever 12 and the connection of the link 6 with the knife and bell-crank lever, a vertical reciprocation.

Specification of Letters Patent.

Divided and this application filed January These combined movements of the point and adjacent cutting edge of the knife are successive but almost simultaneous at high speed, and result in a so-called jig-knife movement that has proved to be durable and effective in the cutting of fabric at high speed, the point and cutting edge moving in an approximately elliptical path. It willbe seen that the knife is readily removable from its actuating devices, for sharpening or substitution.

By lowering the supporting rod, the knife is bodily lowered to bring its piercing and cutting surfaces into various working levels or to bring them wholly out of the path of the goods. In underclothing work it is sometimes necessary to cut the two walls of a flattened tube, sometimes necessary to cut through only one wall thereof, and at other times necessary not to cut through either wall. The described cutter works through an opening 23 in the work plate 24 and in action cooperates with a stationary ledger blade 25. The supporting rod 14 is slidable in a hole through a stationary guide bracket 26, and when it is lowered the end of the lever 12 to which the shank of the movable knife 8 is pivoted at 11 is lowered, thereby lowering the point of the knife to an extent dependent on the extent to which the supporting rod is lowered. The ledger blade is carried by a needle guard 27 which is fixed to the work or throat plate.

I am aware that a work plate slotted for movement therethrough of a vibrating cutter blade and such a cutter blade in cooperation with a cutter-blade-actuating and goods-feeding mechanism, are old. My invention is an attachment which in the form shown is wholly independent of any goodsfeeding mechanism.

What I claim is,

In a cutting attachment, the combination of a work-plate slotted for movement therethrough of an endwise and edgewise vibratable cutter blade; such cutter blade; at revoluble crank shaft; a bell-crank lever; a link pivoted to the cutter blade and also pivoted to the bell-crank lever; a pitman connecting the crank shaft and bell-crank lever; a rod-supported lever pivoted to the cutter blade and also pivoted'to another pitman connected with the crank shaft; such other Patented June 1, 1920 pitman; and a movable supporting rod to which said rod-supported lever is pivotally connected; the cutting movements of the cutter blade being effected by the rotation of the crank when the supporting rod is positioned to move the rod-supported lever to pass the cutting edgeof the cutter blade into cutting position relatively to the slotted Work plate, and the cutting movements of the cutter blade being arrested when the 10 supporting rod is positioned to move the rod-supported lever to Withdraw the cutting edge of the cutter blade from cutting-position relatively to the slotted Work plate.

In testimony whereof I have hereunto set 15 my hand this 27th day of December, 1918.

JOHN PETER WEIS. 

